After choosing what structures are required in your city, you should start upgrading whatever ASAP to the optimum enabled level. If you desire higher level structures, that level is generally chosen by the level of your castle-- so make sure to increase that. There are a heap of helpful structures in the game and their numbers are big, so you will have to focus on at. You can tap the little hammer icon near the large hammer icon in the lower left corner and tap the eye button. This will reveal you not just what resources each building you have produces, however also their level. This makes it a bit simpler to make certain that you have actually updated all your structures to the optimum level. My suggestion is to do so prior to getting a new level for your castle.